Yes, absolutely, though the misconception that this is still key is something I see on here fairly often.
@TempestTost, well, yes, but the university-educated professional who grew up dirt poor, and who is still surrounded by close relatives who work in minimum wage, unskilled jobs is still in a very different position to the similarly-educated professional who grew up in the UMC with surgeon parents, even if day to day life looks similar.
One of the things I'm realising now as my parents, and the parents of my peers hit their eighties, if still living, is the difference social class and occupation makes to your health as you age.
DH and I are lucky enough to have all four parents still (aged between 79 and 82), but whereas the similarly-aged parents of our friends, who are retired lawyers, academics, journalists, medics etc are doing things like regretfully deciding it will be their last skiing season and are in very good shape, ours are in much worse shape.
Combination of physically-demanding manual jobs (my father has terrible back problems from heavy lifting for decades, and has limited use of his hands because arthritis seems to be attacking fingers that he crushed in an industrial accident in the 70s, and FIL is similar), poor nutrition when younger (especially in the case of MIL and DM, in families were limited protein was kept for the working men), and poor healthcare, far too many pregnancies in the case of my DM and MIL, or reluctance to access healthcare when older.
And the difference in life expectancy in the richest and poorest areas in the UK is shocking, as is how long you can expect to live in reasonable health.